Idk about raws but this link has volume 3-12 (end) in Vietnamese, the link mentioned in earlier comment doesn’t work
http://tuthienbao.com/forum/forumdisplay.php?f=642
Spoiler (end)
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In short, they all decided to stay, won the war and changed history for the better using their knowledge and expertise. Eri accidentally got sent back at the last battle. She saw that the world has completely changed due to the change in history caused by the group. She eventually recovered and became the #1 history professor in Japan and eventually found the cellphones of everyone that stayed in the past which recorded their messages for Eri, cheering her on and wishing that the world has become a better place. Eri confirmed that the world has indeed become better and realized her role as a history recorder and was very happy that they won.
I want to know the ending of this manga. Is someone knows how this manga ending? I need spoiler since the manga has been dropped by the scanlator. Or a link to the raws wold be appreciated.